Efficient use of add(0,object) method of java.util.List

If you want an efficient access of add(0,object) method of List interface, where quick and random access of the list is not a primary concern. You must use java.util.LinkedList instead of ArrayList,LinearList and Queue.

You can check the efficiency of LinkedList inplementation by the given example:

import java.util.ArrayList;
import java.util.LinkedList;
import java.util.List;

public class EfficientList
{

/**
* @author Prabir Karmakar
*/
public static void main(String[] args)
{
List list = new ArrayList();
System.out.println(“Using ArrayList..”);
System.out.println(“Before Manupulation:”
+System.currentTimeMillis());
for(int i=0;i<10000;i++)
{
list.add(0, “prabir”+i);
}
System.out.println(“After Manupulation:”
+System.currentTimeMillis());

List list1 = new LinkedList();
System.out.println(“Using LinkedList..”);
System.out.println(“Before Manupulation:”
+System.currentTimeMillis());
for(int i=0;i<10000;i++)
{
list1.add(0, “raj”+i);
}
System.out.println(“After Manupulation:”
+System.currentTimeMillis());
}
}

Program Output

Using ArrayList..
Before Manupulation:1250946828955 (current time Millis)
After Manupulation:1250946829024 (current time Millis)
Using LinkedList..
Before Manupulation:1250946829024 (current time Millis)
After Manupulation:1250946829034 (current time Millis)

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